lshapz / square-number-web-0916

Square Number

Background

In mathematics, a square number or perfect square is an integer that is the square of an integer;[1] in other words, it is the product of some integer with itself. For example, 9 is a square number, since it can be written as 3 × 3.

• Wikipedia

Objectives

Write a method that, when given a square number, returns the integer that when squared, results in the given argument without using Ruby's built-in math methods, like sqrt(x).

This method should return false when given a number that is not a square number.

Examples

Remember that four times four equals sixteen. Therefore, when your method square_number? is called on sixteen, it should return four. Same with nine and eighty-one.

16.square_number?
# => 4

81.square_number?
# => 9

However, no whole number times itself equals 17 (four times four equals sixteen and five times five is twenty-five). Therefore, calling ``square_number?` on seventeen should return false.

17.square_number?
# => false

Note

Challenge yourself and avoid using Ruby's built-in math methods, such as sqrt(x).

Resources

• Wikipedia - Square Number

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